<!DOCTYPE html>
<html lang="en">
<head>
  <meta charset="UTF-8">
  <meta name="viewport" content="width=device-width, initial-scale=1.0">
  <meta http-equiv="X-UA-Compatible" content="ie=edge">
  <title>导航</title>
  <link href="https://maxcdn.bootstrapcdn.com/bootstrap/3.3.7/css/bootstrap.min.css" rel="stylesheet">
  <style media="screen">
    ul li{
      text-transform: uppercase;
    }
  </style>
</head>
<body>
  <h2>标签页：</h2>
  <ul class="nav nav-pills nav-justified">  <!--nav-tabs-->
    <li role="presentation" class="active"><a href="#">Home</a></li>
    <li role="presentation"><a href="#">About</a></li>
    <li role="presentation" class="disabled"><a href="#">List</a></li>
  </ul>

  <h2>添加下拉菜单的标签页：</h2>
  <ul class="nav nav-tabs">
    <li role="presentation"><a href="#">Home</a></li>
    <li role="presentation"><a href="#">House</a></li>
    <li role="presentation" class="dropdown">
      <a href="#" class="dropdown-toggle" data-toggle="dropdown" role="button" aria-haspopup="true" aria-expanded="true">
        Dropdown<span class="caret"></span>
      </a>
      <ul class="dropdown-menu">
        <li><a href="#">dwopdown1</a></li>
        <li><a href="#">dwopdown2</a></li>
        <li><a href="#">dwopdown3</a></li>
      </ul>
    </li>
    <li><a href="#">Help</a></li>
  </ul>

  <script src="https://cdn.bootcss.com/jquery/3.2.1/jquery.min.js"></script>
  <script src="https://cdn.bootcss.com/bootstrap/3.3.7/js/bootstrap.min.js"></script>
</body>
</html>
